Created attachment 1983008 [details]
Page source dump.

Description of problem:

When we enter a BZ for anaconda component with this URL:

https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&version=rawhide&component=anaconda&short_desc=SHORT_DESC&comment=COMMENT

the value of Details textarea "COMMENT" is overwritten by ''

Version-Release number of selected component (if applicable):

5.0.4.rh89
I think some weeks ago we didn't hit this problem.

How reproducible:

always

Steps to Reproduce:
1. https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&version=rawhide&component=anaconda&short_desc=SHORT_DESC&comment=COMMENT
2. See that the Details text area does not contain the 'COMMENT' value
3.

Actual results:

Empty Details / "#comment" textarea.

Expected results:

The "COMMENT" string is kept.

Additional info:

We are going to use the URL for bug reporting from Anaconda installer via opening the link.

If we don't specify the component:
https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&version=rawhide&short_desc=SHORT_DESC&comment=COMMENT
the Details is not overwritten.

Seems that the value is overwritten by get_def_templ function (`comment.val('').data('changed', false);`):

function get_def_templ(name) {
    if (name === "") return;
    new Rpc("Component", "get", {
            names: [{
                component: name,
                product: 'Fedora'
            }]
        })
        .done(function (result) {
            if (result.components[0].template_id == 1) {
                var comment = $("textarea[name=comment]").first();
                if (comment.data('changed')) {
                    if (!confirm("This will overwrite your changes in the description. Continue?")) return;
                }
                comment.val('').data('changed', false);
                $('.basic_info').removeClass('bz_default_hidden');
            } else {
                $('.basic_info').addClass('bz_default_hidden');
                $('#bvp_t_' + result.components[0].template_id).click();
            }
        });
}

function PutDescription() {
    $('#' + get_def_templ($("#component").val()));
    var $sel = $("#component").selectize()[0].selectize;
    if ($sel && $sel.getValue()) {
        $("#description").html($sel.options[$sel.getValue()]['title']);
    }

Maybe we need to update some data configuration for 'anaconda' component?